I've just added some symbols from data source (Interactive Brokers) and I see when I right click on the instument in QM then click Edit Symbol>Settings the default raido button for Use Custom Settings is selected. Should I change this to Use Exchange and ECN's Settings?

I already changed a few but it look like I can just select the Custom Settings radio button to get it back how it was, I'm just unclear on what the settings should be.

Is there any documentation for the settings values or how to correctly calculate them from contract spec information? I'm a little hesitant to just jump in and try and figure it out myself after seeing the dramatic changes in backtesting results from minor changes in the symbol settings.

Also, should the settings for the live data exactly match the settings of the historical ascii data?

Splint wrote:I added 6AM2 from Data Source (Interactive Brokers) and the Exchange and ECN's settings for that were Price Scale:1/10000, Min.Move:1, Big Point Value:1.

That's indeed not correct. Judging from the BPV, might you have chosen the FX or FOREX exchange (instead of CME)? (Just to rule out this possibility)

Splint wrote:Is there any documentation for the settings values or how to correctly calculate them from contract spec information? I'm a little hesitant to just jump in and try and figure it out myself after seeing the dramatic changes in backtesting results from minor changes in the symbol settings.